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OK, folks. I have completed a root barrier installation yesterday. Here is the details.

Why?
If you have trees less than 3 yards away from your driveway, concrete slabs or foundation, a high chance is their roots will start to crawl under it, bend and crack it.
Left with no care for 5-15 years you may end up replacing your driveway (at best, and appr. $2K-5K worth of work) or having problems with your house foundation (at worst, and lots of lots of money).

Solution
They used to have interlocking metal/plastic panels called root barrier. They surround the trees or block the root access to the slab areas. This is the tradition.

Now an alternative would be a fiber barrier with pesticide capsules, that chemically deter roots from coming through. Biobarrier is one of a few names.

How much?
A roll of 20" x 100' Biobarrier costs around $450 online or from a local retailer. I have used half (say, $250 worth of material). I have also hired 2 Mexican street professionals and they have digged a 50' trench for around $500 (1.5-2 days job). A total of around $800 (including lunch for my skilled labor